The Promise of grace

"The first covenant, being a covenant of works, was not sure: but, through man's failure, the benefits designed by it were cut off; and therefore, the more effectually to ascertain and ensure the conveyance of the new covenant, there is another way found out, not by works (were it so, the promise would not be sure, because of the continual frailty and infirmity of the flesh), but by faith, which receives all from Christ, and acts in a continual dependence upon him, as the great trustee of our salvation, and in whose keeping it is safe."

- Matthew Henry

Romans 4:13-17